MB3775PF-XXX datasheet, PDF - EEWORLD Datasheet

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MB3775PF-XXX: DescriptionDual Switching Controller, 0.075A, 500kHz Switching Freq-Max, PDSO16, 5.30 X 10.15 MM, 2.25 MM HEIGHT, 1.27 MM PITCH, PLASTIC, SOP-16; CategoryPower/power management The power supply circuit; File Size596KB，32 Pages; ManufacturerFUJITSU; Websitehttp://edevice.fujitsu.com/fmd/en/index.html

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MB3775PF-XXX Overview

Dual Switching Controller, 0.075A, 500kHz Switching Freq-Max, PDSO16, 5.30 X 10.15 MM, 2.25 MM HEIGHT, 1.27 MM PITCH, PLASTIC, SOP-16

MB3775PF-XXX Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	FUJITSU
package instruction	SOP,
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	DUAL SWITCHING CONTROLLER
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	18 V
Minimum input voltage	3.6 V
Nominal input voltage	6 V
JESD-30 code	R-PDSO-G16
length	10.15 mm
Number of functions	1
Number of terminals	16
Maximum operating temperature	85 °C
Minimum operating temperature	-30 °C
Maximum output current	0.075 A
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
Maximum seat height	2.25 mm
surface mount	YES
Switch configuration	SINGLE
Maximum switching frequency	500 kHz
Temperature level	OTHER
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	5.3 mm

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FUJITSU MICROELECTRONICS

DATA SHEET

DS04-27204-5Ea

ASSP

BIPOLAR

SWITCHING REGULATOR

CONTROLLER

MB3775

■

LOW VOLTAGE DUAL PWM SWITCHING REGULATOR CONTROLLER

The MB3775 is a dual pulse-width-modulation control circuit. It contains the basic circuits required for two PWM

control circuits. Complete synchronization is obtained by using the same oscillator output waveform.

This IC can provide following types of output voltage: step down, step up, and inverter. Power consumption is low,

thus the MB3775 is ideal for use in high-efficiency portable equipment.

■

FEATURES

•

•

•

•

•

•

•

•

Wide supply voltage range: 3.6 V to 18 V

Low current consumption: 1.3 mA typical

Wide oscillation frequency range: 1 kHz to 500 kHz

On-chip timer latch short protection circuit

On-chip under voltage lockout protection

On-chip reference voltage: 1.28 V

Variable dead time provides control over total operating range.

Two types of packages (SOP-16pin : 1 type, SSOP-16pin : 1 type)

■

APPLICATIONS

• LCD monitor/panel

• Surveillance camera

etc.

Copyright©1994-2008 FUJITSU MICROELECTRONICS LIMITED All rights reserved

2006.5

MB3775

■

OPERATION DESCRIPTION

1. Reference voltage

The reference voltage circuit generates a stable, temperature-compensated 2.5 V reference from Vcc terminals

(pin 9) for use by internal circuits.

A reference voltage of temperature compensated 1/2 V

REF

can be obtained to external circuit by V

REF

terminal

(pin 16).

2. Oscillator

A triangular waveform of any frequency is obtained by connecting an external capacitor and resistor to the C

T

terminal (pin 1) and R

T

terminals (pin 2).

The amplitude of this waveform is from 1.3 V to 1.9 V. The oscillator is internally connected to the non-inverting

inputs of the PWM comparators. The oscillator waveform is available at the C

T

terminal (pin 1).

3. Error amplifiers

The error amplifier detects the output voltage of the switching regulator.

The common-mode input voltage range is

−0.2

V to 1.45 V, so the input reference voltage can be set the V

REF

terminal (pin 16) and GND terminal levels. Error amplifiers can be used as either inverting and non-inverting

amplifiers.

The voltage gain is fixed. Phase compensation is possible by connecting a capacitor to the FB terminals (pins

5 and 12) of the error amplifiers.

The error amplifier output are internally connected to the inverting inputs of the PWM comparators and also to

the short protection circuit.

4. Timer latch short protection circuit

The timer latch short protection circuit detects the output levels of the error amplifiers. If one or both error amplifier

outputs are 1.1 V or lower, the timer circuit begins charging the externally connected protection enable capacitor.

If the output level of the error amplifier does not drop below the normal voltage range before the capacitor voltage

reaches the transistor base-emitter voltage V

BE

( 0.65 V), the latch circuit turns the output drive transistor off

and sets the dead time to 100 %.

5. Under voltage lockout protection circuit

An ambiguous transition state at power-on or a momentary fluctuation in the supply line may result in loss of

control and may adversely affect or even destroy the system. The under voltage lockout protection circuit com-

pares the internal reference voltage level with the supply voltage level. If the supply voltage level falls below the

reference level the latch circuit is reset the output drive transistor is turned off and the dead time is set to 100%.

The protection enable terminal (pin 15) is pulled “Low”.

6. PWM comparator

Each PWM comparator has two inverting inputs and one non-inverting input. This voltage-to-pulse-width con-

verter controls the output pulse width according to the input voltage.

The PWM comparator turns the output drive transistor on when the oscillator triangular waveform is higher than

the error amplifier output and the dead time control terminal voltage.

7. Output drive transistor

The open-collector output-drive transistors provide common-emitter output of 18 V dielectric capability. The

output drive transistors can source up to 50 mA of drive current to the switching power transistor.

3

MB3775PF-XXX Related Products

	MB3775PF-XXX	MB3775PFV-XXX	MB3775PF-XXXE1	MB3775PFV-XXXE1
Description	Dual Switching Controller, 0.075A, 500kHz Switching Freq-Max, PDSO16, 5.30 X 10.15 MM, 2.25 MM HEIGHT, 1.27 MM PITCH, PLASTIC, SOP-16	Dual Switching Controller, 0.075A, 500kHz Switching Freq-Max, PDSO16, 4.40 X 5 MM, 1.45 MM HEIGHT, 0.65 MM PITCH, PLASTIC, SSOP-16	Dual Switching Controller, 0.075A, 500kHz Switching Freq-Max, PDSO16, 5.30 X 10.15 MM, 2.25 MM HEIGHT, 1.27 MM PITCH, ROHS COMPLIANT, PLASTIC, SOP-16	Dual Switching Controller, 0.075A, 500kHz Switching Freq-Max, PDSO16, 4.40 X 5 MM, 1.45 MM HEIGHT, 0.65 MM PITCH, ROHS COMPLIANT, PLASTIC, SSOP-16
Is it Rohs certified?	incompatible	incompatible	conform to	conform to
package instruction	SOP,	LSSOP,	SOP,	LSSOP,
Reach Compliance Code	compliant	compliant	compliant	compliant
ECCN code	EAR99	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER
Control Technology	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	18 V	18 V	18 V	18 V
Minimum input voltage	3.6 V	3.6 V	3.6 V	3.6 V
Nominal input voltage	6 V	6 V	6 V	6 V
JESD-30 code	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16
length	10.15 mm	5 mm	10.15 mm	5 mm
Number of functions	1	1	1	1
Number of terminals	16	16	16	16
Maximum operating temperature	85 °C	85 °C	85 °C	85 °C
Minimum operating temperature	-30 °C	-30 °C	-30 °C	-30 °C
Maximum output current	0.075 A	0.075 A	0.075 A	0.075 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	LSSOP	SOP	LSSOP
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH	SMALL OUTLINE	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	2.25 mm	1.45 mm	2.25 mm	1.45 mm
surface mount	YES	YES	YES	YES
Switch configuration	SINGLE	SINGLE	SINGLE	SINGLE
Maximum switching frequency	500 kHz	500 kHz	500 kHz	500 kHz
Temperature level	OTHER	OTHER	OTHER	OTHER
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	1.27 mm	0.65 mm	1.27 mm	0.65 mm
Terminal location	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
width	5.3 mm	4.4 mm	5.3 mm	4.4 mm
Maker	FUJITSU	-	FUJITSU	FUJITSU

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